I have been having problems with my 03 LS for a couple of months now. It has 77K miles on it, and I have had it at the dealership 4 times in the last couple of months for the same problem with no resolution. The car loses power and will not accelerate. Soon after, the wrench indicator light comes on, followed by the check engine light. The mechanics at the dealership have done the following to try and solve the problem:
1st - Replaced the throttle control valve
2nd - Replaced both fuel pumps and cleaned the gas tank
3rd - Replaced ALL six coils
I have had the car back now for a couple of weeks and managed to put a thousand miles on it before the same problem happened again. The last time I picked it up, the mechanic metioned that he was having nightmares about my car. Any ideas or suggestions out there??